Earths and Screens
In all Focusrite modules the chassis is connected directly to the mains safety earth. For safety
reasons we do not provide an earth lifting switch: such a switch can allow for a dangerous wiring
arrangement. It is
IMPERATIVE
that the chassis / mains earth connection is maintained through
the IEC lead to the mains safety earth terminal.
For all outputs the screen, pin 1 of the XLR, is connected to the audio circuit bipolar 0 volt point
only.
For all inputs the screen, pin 1 of the XLR, is connected to the chassis earth point and there is no
direct connection between the input screen pin 1 and the audio circuitry or the audio bipolar power
supply.
All phantom power is completely floating and does not change these connection rules.
Internally in the power supplies there are noise filtering capacitive connections between the
chassis, the screen and the various DC rails at 0 volts.
When the screen and earth wiring of the module is completed correctly, all modules which are
marked with the European Community CE marking comply fully with the CE EMC directive.
Installation
The installation of all the Focusrite modules is straightforward and should not cause any difficulties
with standard 19" racking systems. The mechanics of the modules are well inside the limit
dimensions of both metric and imperial (as used in the USA and Canada) racks.
Apart from the usual considerations of safety, neatness and good engineering practice, there are a
couple of additional comments about the modules:
Operation
Detailed operation descriptions of all the control functions are given for each module in turn.
This section of the guide has been written with the assumption that you are aware of the basic
principles of the module's function. If you would like further operational guidance or if there is any
confusion then please do not hesitate to contact either your dealer or the factory for further
explanation or help. Contact details for the factory are on the inside front cover of this guide.
